Burglar-alarm



1. J. LISTER. Burglar-Alarm.

No. 226,236. Patented April 6,1880.

N PETERS Pl-lo'ro-LrrnoGRAPHEB. WASHINGTON. D c.

UNrrn STATES ISAAC J. LISTER, OF RIOHWOOD, OHIO.

BURGLAR-ALARM.

SPECIFICATION forming part of Letters Patent No. 226,236, dated April 6, I880.

Application filed February 28, 1880.

To all whom it may concern:

Be it known that I, ISAAC J. LISTER, of Richwood, in the county of Union and State of Ohio, have inventedcertain new and useful Improvements in Burglar-Alarms; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being bad to the accompanying drawings, which form a part of this specification.

Figure 1 is a perspective view, showing the device in position for operation. Fig. 2 is a side view; and Fig. 3 is a sectional view on the line 00 m, Fig. 2.

Corresponding parts in the several figures are denoted by like letters of reference.

This invention relates to burglar-alarms; and it consists in certain improvem nts in the construction of the same, which will be hereinafter fully described, and particularly pointed out in the claim.

In the drawings hereto annexed, A represents a rod or bar, of iron or other suitable mater1al,provided at its front end .ith a downward-projecting prong or spike, B, andf'zi t its rear end with an upright, 0, having aforwardprojecting arm orbracket, D, of greater length than the rod A.

Upon the side of the arm or bracket D is secured a strong bow-spring, I), provided at its free end with a stud or striker, E, adapted to enter a recess, F, in which a percussion-cap may be adjusted and held in position by a cross-piece, G.

Near the end of bracket D is pivoted a lever, H, provided at one end with a stud, I, beveled on top, and adapted to enter under the hammer end of spring D, for the purpose of holding the hammer or striker out from the receptacle or recess in which the percussioncap is held.

The operation of my invention will be readily understood from the foregoing description and by reference to the drawings hereto annexed.

The spring is raised and supported upon the beveled stud I of lever H. A cap is then placed in the recess F, and the apparatus is now ready to be placed in position in front of a door. To do this it is simply placed in such a position that the door, when opened, shall strike the lever H, thus releasing the spring and causing the explosion of the cap.

The apparatus is retained in position by the spur or spike B, which enters the floor, and it may be partly or wholly concealed by a carpet, rug, or mat, which may be easily replaced when the apparatus is removed.

Having thus described myinvention, Iclaim and desire to secure by Letters Patent of the United States- As an improvement in burglanalarms, the combination, with .the frame A O D, having spur B, recess F, and cross-piece G. of the bow-spring D, having hammer E, and the lever H, having beveled stud I, all arranged and operating substantially as and for the purpose shown and specified.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in presence of two witnesses.

ISAAC JAMES LISTER.

Witnesses:

S. S. GARDINER, JOSEPH EDWARDS. 

